Speak to your conductor and your director about if they anticipate using ANY props or scenery, or if they will just be wandel-ing around a bare stage. I once did a Cosi where the union crew was released for meal break during the wandel because the director didn't want to use props, but at downbeat the conductor said the timing of the props was too linked to the music and it became a full out run. (Because it was a music rehearsal the conductor trumped the director, and our production manager called the crew back. They went into overtime by the time they did the wandel, reset for the piano tech that followed and then actually ran the piano tech without a meal break.)
Occasionally a lighting designer will want to build cues over the wandel, its a bonus for them to hear the full orchestration and see the singers move. The extent of the cuing should be talked about in advance, some conductors hate having the lights change while they are doing the initial work with the singers.
Enjoy.